RRB Group D 15-Oct-2018 Shift 1 Solved Paper

Energy Consumed is expressed in kiloWatt hour (kWh) or what we commonly call as unit
Energy = Power × Time (for getting Energy in "kiloWatt hour or unit", make Power in kilo Watts and Time in Hours). So Here,
Power = 200 Watts or 0.2 kilo Watts
Time = 5 Hours/day
So Energy consumed in 7 days (in kWh or Unit)
= 0.2 kW × 5 hour × 7 days = 7 kWh or 7 units